package cn.exlu.wxcall.util;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

public class Utility {
	 public static void setListViewHeightBasedOnChildren(ListView listView) {
         //获取ListView对应的Adapter
     ListAdapter listAdapter = listView.getAdapter(); 
     if (listAdapter == null) {
         // pre-condition
         return;
     }

     int totalHeight = 0;
     for (int i = 0, len = listAdapter.getCount(); i < len; i++) {   //listAdapter.getCount()返回数据项的数目
         View listItem = listAdapter.getView(i, null, listView);
         listItem.measure(0, 0);  //计算子项View 的宽高
         totalHeight += listItem.getMeasuredHeight();  //统计所有子项的总高度
     }

     ViewGroup.LayoutParams params = listView.getLayoutParams();
     params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
     //listView.getDividerHeight()获取子项间分隔符占用的高度
     //params.height最后得到整个ListView完整显示需要的高度
     listView.setLayoutParams(params);
 }
}
